Mono bluetooth speaker



FIG. 1 is a top, front perspective view of a mono bluetooth speaker showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-sectional view thereof along line 8-8 in FIG. 6.

The broken lines in the drawings illustrate environmental material that forms no part of the claimed design. 

CLAIM The ornamental design for a mono bluetooth speaker, as shown and described. 